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Posted to dev@kafka.apache.org by "Chia-Ping Tsai (Jira)" <ji...@apache.org> on 2026/10/01 08:41:00 UTC

[jira] [Created] (KAFKA-21195) Use RE2/J in ClientMetricsConfigs

Chia-Ping Tsai created KAFKA-21195:
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             Summary: Use RE2/J in ClientMetricsConfigs
                 Key: KAFKA-21195
                 URL: https://issues.apache.org/jira/browse/KAFKA-21195
             Project: Kafka
          Issue Type: Improvement
            Reporter: Chia-Ping Tsai
            Assignee: Chia-Ping Tsai


ClientMetricsConfigs uses java.util.regex to compile the match patterns of client metrics subscriptions. We should switch to RE2/J, which is already used by the broker and guarantees linear time matching.

This is a behavior change. A pattern stored on the server may be valid in java.util.regex but invalid in RE2, so we need to catch the error and log a warning instead of failing after upgrade.



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